The term 'violin attachment' refers to three components that are used to enhance the sound of a violin. The first is IST, which stands for 'internal sound transducer, ' and is a device that is placed inside the violin to amplify its sound. The second is MUTE, which is a device that is placed on the bridge of the violin to reduce the volume of the sound. Finally, the third component is CHINREST, which is a small piece of wood or plastic that is attached to the violin's neck and helps the player to hold the instrument in the correct position. All three of these components are essential for producing the best sound from a violin.